To increase the amount of neurotransmitter released onto a postsynaptic cell, the presynaptic cell would have to
A) send action potentials with longer durations.
B) send action potentials with higher voltage (higher amplitude).
C) send action potentials with higher frequency.
D) do nothing; no change is possible since the all-or-none law is in effect.
C) send action potentials with higher frequency.
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The organ that is connected to the hypothalamus by neurons is the
A) Anterior pituitary. B) Posterior pituitary. C) Adenohypophysis. D) Thyroid.
Match each term with its definition or description.
a. ovary b. oviduct c. fimbriae d. cervix e. fundus f. myometrium g. vagina h. Bartholin’s glands i. lactiferous ducts j. clitoris k. spermatogenesis l. primary spermatocyte m. sperm n. gonads o. oogenesis p. ova q. polar bodies r. endometrium s. zygote t. spermatogonia 1. _____ Fringelike projection on the funnel-shaped end of the oviduct 2. _____ The lower, narrow part of the uterus 3. _____ Produces a mucus-like lubricating fluid near the outlet of the vagina 4. _____ Essential organ of the female reproductive system 5. _____ Opening of the female reproductive system to the outside; it receives sperm 6. _____ Drains milk from the alveoli of the breasts 7. _____ Tube that carries the egg from the ovary to the uterus 8. _____ Part of the uterus that lies above the entry point of the oviducts 9. _____ Structure containing erectile tissue in the female external genitalia 10. _____ Muscle layer of the uterus 11. _____ Male gamete 12. _____ Female gamete 13. _____ Formed as a result of fertilization 14. _____ Name given to the essential organs of the male and female reproductive system 15. _____ Process of sperm production 16. _____ Precursor or stem cell for the production of sperm 17. _____ Cell that undergoes meiosis to form spermatids 18. _____ Process of egg production 19. _____ Produced during oogenesis but do not develop and eventually degenerate 20. _____ Mucous membrane lining the interior of the uterus
Cross bridges
a. bind to actin during muscle contraction b. are globular heads made of myosin c. do not bend during muscle contraction d. have characteristics a and b e. have characteristics b and c
The percentage of erythrocytes in blood is known as the ________
A) hematocrit B) buffy coat C) hemoglobin D) plasma